Never looked on here before, as I'm a window cleaner, but I have a problem with stains on a carpet. They're pretty well all round the room at the edge, I think they're dust marks coming up a from wooden floor where an over enthusiastic fitter used the stretcher to heavily and has presumably pierced the underlay letting the dust rise through.
Can these marks be removed with standard carpet shampoo, they've been there for quite a while.
Thanks